Dielectric filter coupling structure, dielectric filter and communication base station

Abstract

The invention relates to a dielectric filter coupling structure, a dielectric filter and a communication base station. The dielectric filter coupling structure comprises a body made of a dielectric material and at least one pair of dielectric resonators arranged on the surface of the body, wherein a through hole penetrating through the body is formed between the first dielectric resonator and thesecond dielectric resonator of the pair of dielectric resonators; the first dielectric resonator and the second dielectric resonator are located on the upper surface and the lower surface of the bodyrespectively; the first dielectric resonator is connected with the through hole through a first coupling groove; the second dielectric resonator is connected with the through hole through a second coupling groove; and the first dielectric resonator and the second dielectric resonator are connected through the coupling grooves and the through hole to achieve capacitive coupling. According to the invention, stronger coupling bandwidth can be realized, and the dielectric filter coupling structure can adapt to wider application scenarios.

Description

technical field [0001] The invention relates to a communication device, in particular to a dielectric filter cross-coupling technology. Background technique [0002] With the construction of 5G communication systems, the requirements for the integration of its equipment are getting higher and higher. The miniaturization and light weight of microwave filters are the future application trends. The dielectric waveguide has the advantages of high Q value and small temperature drift. It is a kind of Good filter miniaturization solution. [0003] Dielectric filters usually need to introduce capacitive cross-coupling to achieve strong suppression of transmission zeros. To achieve low-end transmission zeros and symmetrical transmission zeros, it is necessary to introduce a capacitive coupling structure (a single high-end transmission zero sometimes does not need to introduce a capacitive coupling structure. ), the traditional dielectric waveguide filter usually adopts the following...

AI Technical Summary

Problems solved by technology

[0003] Dielectric filters usually need to introduce capacitive cross-coupling to achieve strong suppression of transmission zeros. To achieve low-end transmission zeros and symmetrical transmission zeros, it is necessary to introduce a capacitive coupling structure (a single high-end transmission zero sometimes does not need to introduce a capacitive coupling structure. ), the traditional dielectric waveguide filter usually adopts the following forms to realize capacitive coupling: 1. The frequency-dependent coupling structure is adopted. Although the structure is simple, it will introduce an additional resonance point

2. The capacitive coupling structure derived directly from the fly rod structure of the traditional cavity filter is relatively complicated, and increases the parts and processes of the product

However, the two resonators of this solution are located on the same surface, the magnetic field coupling is strong, the electric field coupling is weak, and the application scenarios are narrow

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